Prince Harry, Duke of Sussex, made his first trip back to the UK following the controversy surrounding the royal race caused by Omid Scobie's book Endgame.
He is trying to overturn a decision that reduced his security status after he ceased to be considered a "working royal".
At the beginning of a three-day hearing in London, Prince Harry's solicitors contended that the decision-making process was unjust.
Case-by-case decisions are made for his security, according to the Home Office.
Earlier, royal expert Angela Levin tweeted, “Prince Harry is taking the Home Office to court for three days seeking protection 24/7 when he comes to the UK.
“Scobie's book will inevitably make him even more unwelcome.”
The Duke of Sussex reportedly showed up in London's High Court on Tuesday morning to begin his three-day legal battle to regain UK security protection for his family members, including wife Meghan Markle, son Prince Archie, and daughter Princess Lilibet, according to a New York Post report.
The state has given Harry and Meghan Markle complete security protection before their decision to leave their royal duties and relocate to California in 2020.
However, as per BBC, Prince Harry allegedly did not attend in person.
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Prince William is the eldest son of Charles and Diana